December 2003 - Air Transport White Paper identifies the need for two more runways in the South East. Amongst other schemes, the Labour Government publishes plans for a third runway and sixth terminal to the north - east of Heathrow Airport between the A4 and the M4 to be built between 2015 and 2020 to keep pace with other European hubs such as Frankfurt and Amsterdam.
February 2008 - Spelthorne Borough Council approved a motion to support a third runway at Heathrow on economic grounds and subject to compliance with EU air quality limits , no increase in the area affected by noise, surface access improvements, no mixed mode and market value compensation for loss of property.
October 2009 - Opposition leader David Cameron promises Heathrow expansion will not go ahead, telling a meeting in nearby Richmond: "No ifs, no buts".
September 2012 - Expansion is back on the table as an independent commission (The Airports Commission chaired by Sir Howard Davies) is set up by Whitehall to consider how the UK can "maintain its status as an international hub for aviation" and take action "to improve the use of existing runway capacity". The Commission was to look at options including new runways at Heathrow and Gatwick and a whole new airport in the Thames Estuary.
March 2013 - The final version of the Aviation Policy Framework published. Document recognizes that the UK has the third largest aviation network in the world and Heathrow's role as a world hub airport supports London's position as a global city and favoured location for international firms.
July 2013 -The Davies Commission invites submissions from any interested party by the 27 September 2013 and receives 52 submissions setting out either specific proposals for new airport capacity or commenting on related issues.
July 2013 - HAL sets out their proposals in their document "Airports Commission - Long-term hub capacity options - Heathrow Airport Limited response, 17 July 2013." This supported two further documents 'A New Approach' (July 2013) and 'One Hub or None - the case for a single hub airport' (November 2012).
September 2013- Spelthorne Borough Council (SBC) responds to the Commission's submissions for additional runway capacity at Heathrow. It gave particular consideration to the proposals by Heathrow Airport Limited who is the owner and operator of Heathrow. It also reflected on the introduction of Thames Estuary options.
December 2013 - Davies Commission Interim Report published. Report included a range of recommended short and medium term actions to improve existing runway capacity and also long term options to provide an additional runway in the South East.
July 2015 - Sir Howard Davies, chair of the Airports Commission, releases his report concluding that Heathrow represents the most suitable location for a new runway in the South-east. The commission backs the development of a third runway to the north west of Heathrow over a second runway at Gatwick.
September 2015 - The Heathrow Strategic Planning Group (HSPG) was established.The group brings together a range of public bodies and stakeholders responsible for the area most directly impacted by the future operation of Heathrow Airport, and who wish to work together to achieve shared objectives.
October 2016 - Theresa May's Government pledges its support for Heathrow expansion, sparking the resignation of Richmond Park MP Zac Goldsmith, triggering a by-election in his seat.
February 2017-The Government publishes a draft National Policy Statement (NPS), for which a 4-month consultation is undertaken. The NPS sets out requirements that Heathrow must comply with to get a development consent order (DCO).
April 2017 - April 2017 - PM Theresa May calls a general election on the 8 June 2017 and the NPS process is delayed.
May 2017 - The Government's 16-week public consultation on the impact of a third runway ends and over 72,000 responses elicited. View the Council's response on the Airports National Policy Statement.
July 2017 - Secretary of State for Transport, Chris Grayling, issues ministerial statement that the final NPS will not be laid before parliament until the first half of 2018.
July 2017 - Heathrow scraps plans for a new terminal to reduce costs, opting instead to expand terminals 2 and 5.
October 2017- The new draft of the government's NPS and the public's responses are published. The new NPS states Heathrow must introduce six more domestic air routes by 2030, provide more support for affected communities, set legally binding noise targets and increase proposed payments to local homeowners. Public consultation on the revised draft begins.
November 2017 - Transport Select Committee begins new probe into the Heathrow expansion proposals a month after the government relaunched a public consultation into the plans after new analysis on noise and air quality impacts come to light.
December 2017 -The public consultation on the NPS draft closes. View the December 2017 Cabinet report on Airports National Policy Statement and
January 2018 - HAL launches its Stage one consultation on airspace change. It outlines design principles and potential areas for airport-related development. Proposals for Compulsory Purchase Zone (CPZ) and Wider Property Offer Zone (WPOZ) are introduced.
March 2018 - Spelthorne Borough Council's (SBC) responds to Heathrow's Consultation One. SBC sets out 10 key demands to protect the interests of its residents and businesses.
Heathrow's Consultation one ends and Transport Select Committee publishes its Airports National Policy Statement (ANPS) .
March 2018 - A cross-party group of MPs on the Transport Select Committee warns expansion should not be allowed without more safeguards on air pollution, noise, regional connections and passenger fees.
April 2018 - Heathrow held a series of "listening events" for communities including Stanwell.
June 2018 - The final NPS backed by Cabinet, with MPs ordered to vote on it in parliament. The revised project is now expected to cost investors £14billion, is given the go-ahead by the Cabinet with a promise taxpayers will not pay a penny. Chris Grayling gives go ahead for Heathrow's third runway, hailing the decision a "historic moment" for the UK.
June 2018 - The House of Commons (MPs) vote by a majority of 296 to approve the government's National Policy Statement.
July 2018 -The London Mayor Sadiq Khan alongside five Councils, Greenpeace and Friends of the Earth formally notify government of their plans to challenge Heathrow Expansion in the courts.
August 2018 - Friends of the Earth begin their High Court legal action against the government over its decision to give the third runway at Heathrow Airport green light. Heathrow Hub starts a judicial review.
September to December 2018 - Heathrow engaged with the Council and other host authorities on some element of the airport expansion. It also held a series of listening events for communities including Stanwell.
January 2019 - Heathrow Airspace and Future Operation Consultation underway. From 8 January 2019 until 4 March 2019, HAL will be consulting on airspace change and future operations for the expanded Heathrow.